Balance slide-valve



(No maal.) y 2 sneetssheen 1 J. E. BAKER.

BALANGBB SLIDE VALVE. Y No. 286,573. Patented Oct. 1.6, 18.83.l

@c l c Cf 7A Z f y j ll l f n /v :2. '.2 MM WEI/'Z555 E5.' Y l .zVEnz-m'. oz/jmmaw/ v E?? /W s 2a/L Y #am UNITED STATES PATENT OEEicE.

JAMES E. BAKER, F MADISON, VISCONSIN.

f BALANCE suce-VALVE.

SPECIFICATION forming part of Letters Patent No. 286,573, dated October 16, 1883.

Y Application filed February 17, 1883. (No model.)

To all whom it moz-y concern:

Be it known that I, JAMES E. BAKER, a citizen of the United States of America, residing at Madison, in the county of Dane and State of Vlisconsin, haveinvented a new and useful Improvement `in Balanced Slide Valves, of which the following is a specification, to wit:

My Ainvention relates to an improvement in slide-valves; and it eonsistsin providing the 1o valve with peculiarly -formed supporting-rockers, substantially as will be hereinafter more fully set forthln order to enable others skilled in the art to which my inventioifrelates to make and i 5 use the saine, l will now proce-edto describeV its construction and operation, referring to the accompanying drawings, in which" vFigure l is a plan view, Fig. 2 a side elevation, Fig. 3 an end view, and Fig. 4 a longi-v o tudinal vertical-section, of my improved valve. A represents a valve -case having Va seat, A', provided withthe usual `inlet and outlet ports, a u.

B Arepresents the valve, formed with the 2 5 ports b b, adapted,as the valve slides back'and forth, to connect the alternate pairs of. inlet and exhaust ports. This valve is provided with the usual rod or stem, B.

Supported by `posts G, secured to the valve, 3o is a cap, C', having at each end, in the center, a pendant lug, C?, formed with a bifurcation in its lower end, as seen in Figs. 3 and 4. The posts C are secured to the cap C by bolts and nuts c, and the posts may be `provided with 3 5 liners i or washers, to properly seat the valve and render it steam-tight. The cap C is supported at each end by a pair of standards, D, formed with rockers D D2 at their upper and lower ends respectively: The upper curved 4o surfaces of the rockers D impinge against the cap, and the lower curved surfaces of the under rockers rest upon the valve-seat A', as clearly seen in Fig. 2. The outer or bearing surfaces of these rockers are curved from a 4 5 common center, or are parts of aperfcct circle, while the inner surfaces are curved upon a circle struck from the center of the `adjacent bearing-surface. The standards D are connected in pairs at each end of the valve, as

- bytherod or stem B', the pendants C2, which `seen `in Figs. 8 and 4, by a cross-arm, D3, which 5o l passes through the bifurcated lug CL and forms a positive connection between the valve and cap, and the supporti11g-rockers compelling them to move together. The lower ends of each pair of rockers or supports are prevented from slipping and held in place by pieces of metal E, bolted to the valve-seat, and having their adjacent ends concaved or curved to correspond to the curve of the inner. surface of the lower rocker, and which curved ends e overlap and hold the rockers in place, as seen by Fig. 2.

It will be seen that the valve, having been properly seated by means of liners upon the posts C C, is hung from or supported by the cap C', which is in turn supported by the rockers, and the valve is thus allowed to move back and forth over the seat with the least friction consistent with steam-tight itting, and conse quently with the least amount of wear. As H the valve and cap are moved in one direction clasp the cross-arms D3, will move the upper part, two pairs of rockers in the same direction rolling or lrocking upon the lower surface of the lower ones, D?, while the cap is carried forward upon the upper curved surface of the rockers D; and, as the two bearingsurfaces of the rockers are parts of a true circle, and their points of contact with the cap 'and valve-seat So are always the same distancc'apart, the valvel will be moved in aperfectly truc line. At the same time, the lower rockers being held in place by the plates E, there can be no slippingv or sliding of either the cap or rockers, but always a rolling movement, which yieldsr the least friction and wear.

' Having thus fully described my invention, what I claim as new,V and desire to secure by Letters Patent, is-

1. ln a slide-valve, a pair of supports connected by a cross-arm and formed on each end withrockers, the outer or bearing surfaces of which are curved from a common center or are parts of a true circle, and their inner surfaces formed -upon a curve struck from the center of their adjacent bearingsurfaces,'sub stantially as and for the purpose set forth.

2. In a slide-Valve, the cap O, having bfursupports E in place, 'as and for the purpose cated lugs C2 and posts C, secured to the set forth. valve B, in combination with the supports D In testimony whereof I affix my signature in D, having connecting-arm D3, and provided presence of two witnesses.

5 on each end with rockers constructed substan- JAS. E. BAKER.

tially as' herein described, and the plates E, Vitnesses: bolted to the valve-seat, and having concz'wod CHARLES E. BRoss,

-ends e, adapted to retain the lower ends of the E. XV. KEYES. 

